How to Find Irish Ancestors Online (2026)

The first thing most people learn about Irish genealogy is that the records were destroyed in a fire. The second thing they learn is that this is both true and incomplete.

True: the Public Record Office in Dublin burned in June 1922 during the Civil War, taking with it most of the Church of Ireland registers held there, the census returns from 1821 to 1891, and the bulk of pre-1858 probate records. This is a real loss.

Incomplete: the fire did not destroy everything. Catholic parish registers were held in parishes, not the PRO, and most survived. The 1901 and 1911 censuses survived intact. Civil registration records from 1864 forward survived. Two nationwide surveys, Griffith's Valuation and the Tithe Applotment Books, give family locations across most of Ireland for the decades before civil registration began.

Here is the order that wastes the least time.

1. The 1922 fire: what was lost and what survives

On 28 June 1922, the Four Courts complex in Dublin was set on fire. The Public Record Office was inside it.

What was destroyed:

• Most Church of Ireland (Anglican) parish registers held centrally in Dublin
• Census returns for 1821, 1831, 1841, 1851, 1861, and 1871
• The 1881 and 1891 census returns (partially destroyed even before 1922)
• Pre-1858 wills and probate papers

What survived:

• Catholic parish registers, held in individual parishes across the country
• Civil registration records from 1864 onward, held separately
• The 1901 and 1911 census returns, held in Dublin Castle rather than the PRO
• Griffith's Valuation (1847-1864) and the Tithe Applotment Books (1823-1837)
• Church of Ireland registers that had already been copied or held locally
• Land records, estate papers, and administrative documents outside the PRO

Practical implication: if your ancestor was Catholic, the fire probably did not destroy the primary source of their records. If they were Church of Ireland, some registers are gone but many local and diocesan copies survive. For either, the period from roughly 1820 to 1864 has workable substitutes even without census records.

2. IrishGenealogy.ie: free civil records and parish registers

IrishGenealogy.ie is the Irish government's free genealogy portal. No account required.

It holds civil registration for the Republic of Ireland: births from 1864, marriages from 1845 (non-Catholic) and 1864 (all), deaths from 1864. It also has a growing collection of digitized Catholic and Church of Ireland parish registers.

Civil registration indexes are searchable by name, year range, and district. Results are scanned originals. A birth entry gives the full name, exact date, parents' names (including mother's maiden name), father's occupation, and registrar's district. A marriage entry adds both parties' ages, fathers' names, and witnesses, who are often relatives worth following.

One practical note: civil registration districts in Ireland use administrative names that often differ from parish and townland names. "Skibbereen" covers a large area of west Cork; "Castlebar" covers much of Mayo. If a surname search in one district returns nothing, try adjacent districts.

The parish register section is less complete but growing steadily. Browse by county and denomination to see what is available before searching.

3. The 1901 and 1911 censuses: free at the National Archives

The 1901 and 1911 Irish census returns are the most valuable surviving genealogical censuses for Ireland. Both are free at census.nationalarchives.ie.

A 1911 return gives: every person in the household on census night, their age, relationship to the head of household, religion, occupation, birthplace county, literacy, and, for married women, how many years they had been married and how many children had been born alive and were still living. That last column is particularly useful: it reveals infant mortality and suggests when children were born in the decade between the two censuses.

The 1901 return has the same basic structure. Comparing both for the same household shows which members died between 1901 and 1911, which children were born in that period, and any changes in household composition.

Browse by county, barony, district electoral division, and then townland. The townland is the fundamental land unit in Ireland, often a cluster of farms a few hundred acres in size carrying a name unchanged since the 17th century. Knowing the townland is more useful than knowing the county.

4. Griffith's Valuation (1847-1864): the main pre-census substitute

Griffith's Primary Valuation is the single most important record for Irish research before 1864. It surveyed every property in Ireland from 1847 to 1864, listing the occupier of each landholding, their landlord, the property description, and its rateable valuation.

Freely searchable at askaboutireland.ie. Each result shows the townland, occupier's name, and a map reference; many entries link to the original survey maps showing individual field boundaries.

For genealogical purposes: Griffith's places a family in a specific townland at a specific point in the mid-19th century. Surname clustering within a townland is practically useful. Six households named Murphy in the same townland, one of whom emigrated to Boston in 1855, is strong circumstantial evidence for identifying which branch of the family left.

The survey brackets the Famine (1845-1852). A low valuation in a western or central townland in the late 1840s reflects the economic reality of those years. Combined with the 1901 census, Griffith's brackets the Famine generation of a family.

5. Tithe Applotment Books (1823-1837)

The Tithe Applotment Books recorded landholders in each parish between 1823 and 1837 for assessing tithes owed to the Church of Ireland. They cover most of rural Ireland and predate Griffith's by two to three decades.

Freely searchable at titheapplotmentbooks.com and also on FamilySearch.

Each entry records the householder's name, townland, and acreage. Spelling is phonetic and varies by clerk: O'Brien becomes OBryen, Shaughnessy becomes Shacknesy. Searching phonetic variants is essential.

Practical use: if Griffith's places a family in a townland in 1850, the Tithe Books can push that family back to the 1820s. If the same surname appears in the same townland in both records, you have evidence of continuous occupation across thirty years, a strong basis for connecting later civil registration records to an established family branch.

6. FamilySearch for Irish records

FamilySearch (familysearch.org) holds extensive Irish records, most free to access.

The main collections include Catholic parish registers microfilmed by the LDS Church beginning in the 1950s and now largely digitized, civil registration indexes, Griffith's Valuation, and Tithe Applotment Books. The Catholic register microfilms often extend earlier than IrishGenealogy.ie, particularly for smaller rural parishes, sometimes reaching back to the 1750s or 1760s.

Browse by county and parish rather than by surname across all of Ireland. Parish-level browsing produces significantly better results than national surname searches, which suffer from inconsistent transcription of Irish names. Connolly, Connelly, Conneely, and Conley all refer to the same surname in different county traditions.

One note on civil registration in FamilySearch: it shows indexes only, not full images. To read the actual register entry, go to IrishGenealogy.ie.

Older Irish handwriting in the 18th and early 19th centuries, particularly from court and estate records, can be difficult to decipher. The article on reading old handwriting in genealogy records covers the AI tools that handle pre-modern scripts most reliably.

7. FindMyPast and PRONI for Northern Ireland

FindMyPast is the strongest paid subscription service for Irish genealogy. Its partnerships with the National Library of Ireland and the Public Record Office of Northern Ireland bring collections not freely available elsewhere.

Key holdings: Irish historical newspaper archives back to the 18th century (obituaries, property sale notices, and court reports that can identify family connections not visible in civil records), Landed Estates Court rentals, and civil registration indexes for Northern Ireland.

For Ulster specifically, the Public Record Office of Northern Ireland (proni.gov.uk) is the primary archive for the six counties. Its eCatalogue is free; many records are digitized, with more available through FindMyPast. PRONI holds Church of Ireland registers, estate papers, tithe records, and valuation books specific to the north, some of which have no equivalent in the Republic's archives.

The 1901 and 1911 census returns for Northern Ireland are the same records as the National Archives site, browsable through the same interface.

8. Emigration records: ship manifests and port arrivals

Irish emigration peaked during and after the Famine (1845-1855) and again between 1880 and 1924. Each wave produced passenger records in the destination countries.

For the United States: Ellis Island passenger manifests cover arrivals in New York from 1892 to 1957, searchable at libertyellisfoundation.org. Each entry includes name, age, last residence in Ireland, a US destination contact (often a relative already in the country), and from 1907 onward, the name of the nearest relative remaining in Ireland, which frequently names the county or even the townland. For pre-Ellis Island arrivals, castlegarden.org covers New York arrivals from 1820 to 1892.

For emigrants to Britain, UK census returns from 1841 to 1911 record birthplace as "Ireland" or occasionally specify a county. Irish immigrants concentrated in Liverpool, Glasgow, Manchester, and London; Liverpool census returns are particularly dense with Irish-born residents.

For emigrants to Australia, assisted passage records from the colonial period often name the home parish. The New South Wales State Archives and Public Record Office Victoria hold these.

The practical workflow: find the ship manifest, note the stated last residence or county of origin, open that county's records on FamilySearch or IrishGenealogy.ie.

9. DNA testing for Irish ancestry

DNA is useful for Irish genealogy in one specific situation: it can bypass the 1922 record gap.

A DNA match who is living in Ireland and has a documented family tree may have already traced the lines that no longer exist in accessible records for your branch. For Irish-American, Irish-Australian, or Irish-Canadian researchers, matching with cousins still in Ireland is the most reliable route around the fire damage.

AncestryDNA has the largest database and the highest concentration of Irish-American testers. The Ancestry database for Irish ancestry is deep enough that even moderately common surnames return useful matches.

MyHeritage^® has a meaningful Irish user base in Ireland itself, with DNA-to-tree matching that can connect a result directly to a documented tree entry and sometimes point to a specific county or parish.

DNA alone does not name a townland. What it does: confirm regional origin (southern Ireland and Ulster have genetically distinguishable patterns), identify cousins who have done the archive research you need, and occasionally give a direct route past record losses that no archive can recover.

The DNA genealogy test comparison covers the main providers and what each returns for Irish ancestry specifically.

When a photograph surfaces

Irish genealogy research often ends with a photograph. A formal studio portrait from Dublin, circa 1890. A woman in a shawl standing outside a stone farmhouse in Clare. A school class in front of a whitewashed wall somewhere in Sligo, 1948, names written in pencil on the back.

A granddaughter living in Montreal traced her grandmother's family back through IrishGenealogy.ie to a parish in Sligo. Along the way she found a class photograph from 1948. She animated it with Incarn and showed her grandmother the result over a video call the following Sunday.

If you find a photograph of an Irish ancestor during your research, Incarn animates it in under two minutes. The first animation is free, €1.99 per photo after that, no subscription.

For a broader view of AI tools useful at each stage of genealogy research, the best AI tools for genealogy research covers 11 tools tested in detail. For the research workflow that connects these sources into a coherent method, building your family tree with AI in 2026 covers the practical approach from first search to documented tree.